2001 Audi S4 Engine cooling Problems

“I have a 2001 Audi S4. There is a vacuum line between the motor and firewall that has a check valve on it. The problem is that the check valve is prone to fail (talked to others on an Audi website that had this part fail also) and when it does, it fails w/o notice and causes the car to lose its power brakes. I think this is extremely dangerous, nothing happened to me, mine failed in a parking lot as I was parking, but what if I or someone had this part fail at say 50-60 MPH and they had to stop the car? They wouldn't be able to. I fixed mine by by-passing this check valve. …”

“Coolant in oil. Can't trace it down, have had 5 rear main seals replaced, had the external oil filter parts replaced and still coolant is finding it's way into the motor, causing the motor to prematurely wear. Audi knows about the issue they have brought engines back to germany for review, but have yet come out with what is happening. What can we fix to stop this. I'm not looking for a recall, heck most people I know would just like to know what Audi messed up and how we can fix it. At this point the fix is unknown, stop leak in the coolant system but that's a bandaid and gunks up the motor. …”

“Vehicle is experiencing radiator coolant leakage into engine oil. This is causing accelerated wear of components lubricated by the engine oil. Unless corrected, this contamination will lead to failure of the motor. The vehicle was inspected and tested by an Audi service center with no cause identified or solution proposed. Audi of america is not taking any action to address this problem.”

“Coolant leaking into engine oil at undetermined location. No cause identified nor solution proposed. Coolant levels in oil high enough to lead to significantly premature engine failure. No recourse provided by Audi of america. Engine replacement only option at present.”

“Dt: there was a cam adjuster from where the oil leak was coming from. Noticed this on august 8, 2003. Then, on july 24, 2004 took the vehicle for an oil change a nd they confirmed there was another oil leak. The warranty expired in november 2005, and the consumer made arrangements for the gaskets to be replaced a month before the warranty ran out. In order to get to the gaskets the cam shafts had to be removed. The gaskets were replaced,, and cam shaft reinstalled, then gave it a tune up. Also, put in two different types of spark plugs; one set was platinum and conventional. …”